Thank you for the advice, I’ll be using 16mm bearings for the tensioner, my reasoning for the belt tensioner is as follows:
As of now for the urethane configuration 40T/16T the tensioner is not needed because the Center to Center distance allows for proper belt grip on to the pulley. The same goes for the AT setup with 62T/16T.
The belt tensioner will be useful for the different sizes of urethane and pneumatics wheels Trampa is planning to sell in the future, This way we are future proof and the distance of the motor plate of mount can be reduce, so not to have the motors sticking out that far from the wheel, because that will damage the look of the whole set up.
The coasting is the reason for the 230 Kv.
At higher kv the drag is minimum and if you take advantage of coasting properly the battery range can be increase and I willl take that every day.
I am one of the guys that really prefer carving and coasting so the motor with lower Kv motors just kill the fun for me.
Unless you ride in a area with a lots of hills then the lower Kv motors are a necessity in order not to overload the battery and ESC.
I think you will not like the idler then, from my experience they add a ton of drag. The best coasting experience i had was with 3M belts and no idler, unfortunately they can handle very low torque when using small pulley
I think this is pretty obvious… @Kaly was just smart enough to point this out and make good reasoning… I have observed this myself… when I try to turn my 192kv motor… there is quite a resistance to overcome by hand…
So yeah, kind of cool that @Kaly pointed this out… as this does make a difference, I believe.
Cant really discuss about the idler pulleys part in creating resistance… I just know that tight belt is better than loose one… so it’s just something you gotta use…for a variety of reasons
You don’t have to take it from me , You can test this for yourself
install lower Kv motor and push your board around the neighborhood a couple of times then do the same with a set of high Kv motors on the board and let me know how it goes.
@Pedrodemio
you are right I don’t use the idlers unless it is a last resource, but at this stage of production the cost of implementation of the anchor threaded hole is so inexpensive that will be a crime if I did not include this, even if is just for future use, IMHO I think is better to have the option and not need it than to need it and do not have it.
i see, i did that, and glad i did when the tensioner was the only thing that made the board rideable, but unfortunately i had to drill one more hole now to change the bearing diameter
Does it really come that close to the tire? Ive got 15mm belt and I could fit 2 x 8mm bearings onto the screw + there were some more additional screws/washers on top of these…
I think this could be a problem for 25mm wide belts… but not 155mm
Though, unless your belt is really close to the wheel itself… because of the sprocket being just a few mm off the tire… so who knows actually…
On the trampa i don’t know, but in my case i’m fitting dual motors on 195mm trucks, with 15mm belts and an additional bearing inside the motor mount, so i had to squeeze each milimeter that i could
As my design stands i had a 2mm clearance from belt to wheel, 1,5mm from belt to motor mount and 5 mm between the motors, so any larger wheel and the idler screw will colide with the wheel
I also took this approach so there is less gaps to little rocks enter the system
Since the Trampa truck is wider you can put the belt farther from booth wheel and mount
Taking advantage of the sunny day
Installed the MBS wheels on this board and gave it a go.
Some pics with the George Washington bridge on the background from NJ.
and the distance of the motor plate of mount can be reduce, so not to have the motors sticking out that far from the wheel, because that will damage the look of the whole set up. 
Though, unless your belt is really close to the wheel itself… because of the sprocket being just a few mm off the tire… so who knows actually…
